Yokogawa NCU4*A Modbus PROFIBUS Interface Module

Product Overview

The Yokogawa NCU4*A is a communication interface module designed for Yokogawa industrial automation systems. It supports multiple industrial communication protocols including Modbus RTU, PROFIBUS DP, and Yokogawa proprietary protocols, enabling seamless integration between Yokogawa DCS platforms and third-party devices such as PLCs, VFDs, and smart instruments.

Key Specifications

• Product Family: Yokogawa Communication Interface Module
• Communication Protocols: Modbus RTU, PROFIBUS DP, Yokogawa proprietary
• I/O Capacity: 8 digital inputs, 8 digital outputs, 4 analog inputs, 2 analog outputs, 2 pulse inputs
• System Compatibility: Yokogawa CENTUM DCS
• Mounting: Rack-mounted in Yokogawa card nest

Features and Benefits

• Multi-protocol support enables integration with diverse third-party devices
• Modbus RTU compatibility connects to standard industrial PLCs and HMIs
• PROFIBUS DP support integrates with Siemens and other PROFIBUS devices
• Built-in I/O channels provide local discrete and analog signal handling
• Compact rack-mount design fits standard Yokogawa DCS card nests
• Reliable communication ensures real-time data exchange in process applications

Applications

• Modbus RTU device integration into Yokogawa DCS
• PROFIBUS DP network connection for Siemens drives and PLCs
• Third-party instrument communication in CENTUM systems
• Protocol gateway between Yokogawa proprietary bus and open standards
• Process skids requiring mixed-protocol communication

FAQ

Q: What does the suffix *A indicate on the NCU4 module?
A: The suffix letter denotes the hardware revision level. NCU4*A is Revision A. Verify compatibility with your specific Yokogawa system version before ordering.

Q: What protocols does NCU4*A support?
A: The module supports Modbus RTU, PROFIBUS DP, and Yokogawa proprietary communication protocols.

Q: How many I/O points are built into the module?
A: The module includes 8 digital inputs, 8 digital outputs, 4 analog inputs, 2 analog outputs, and 2 pulse inputs.

Q: Can this module act as a protocol gateway?
A: Yes. The NCU4*A can bridge between Yokogawa proprietary protocols and open standards such as Modbus RTU and PROFIBUS DP.

Installation Guide

1. De-energize the DCS rack before installing the interface module
2. Align the NCU4*A module with the card nest guide rails
3. Insert the module until the backplane connectors engage fully
4. Connect communication cables to the appropriate protocol ports
5. Wire local I/O signals to the module terminals if using built-in I/O
6. Configure protocol parameters in the Yokogawa engineering station
7. Verify communication integrity with connected third-party devices

Selection Tips

• Select NCU4*A for multi-protocol communication in Yokogawa DCS
• Verify target devices support Modbus RTU or PROFIBUS DP
• Confirm your DCS software version supports Revision A hardware
• Plan network topology to ensure reliable communication paths
• For redundant communication, order two modules for primary/backup setup